Sharp MZ-80SFD Service Manual page 8

1. Belt
1) Inspeetion
Check to see if the belt is stained with dust or dirt.
Also make sure that there· is no unevenness,
scratch and thinned part.
2) Replacement
1) Take the belt off the spindle pulley while rotating
the pulley gradually by hand.
2) For applying the belt, put the belt first on the
motor pulley and then on the spindle pulley while
rotating the spindle pulley.
Note)
1. In putting on and off the belt, be careful so that it
be not caught by the motor pulley flange.
2. Note that there is no difference between both
sides of a new belt.
2. PWB unit
1) Replacement
1) Take connectors J3 and J4 off PWB.
2) Remove 3 PWB unit fixing screws (3 mm).
3) Detach PWB unit.
4) For reassembly, take the reverse order.
Note)
In replacing PWB unit, it is necessary to check
which short pins to cut and whether or not
terminal resistor is required, depending on which
drive unit to use (DRIVE No.).
• Short pin: Detach the short pins from the old
PWB unit· and apply them to a new
PWB.
• Terminal resistor: If the old PWB unit has no
terminal resistor, remove terminal
resistor from a new PWB.
J1 signa'
connector
J2 connector
(power)
,...--'0-----=--1
J3
connector
PWB unit
PWB unit fixing
screw (3 mm): 3 pes.
J4 connector
~ Motor pullev
Keep belt
off the flange.
Socket
-6-